High-pressure cleaning apparatus

• US 5,174,730 A
• Filed: 11/08/1990
• Issued: 12/29/1992
• Est. Priority Date: 05/25/1988
• Status: Expired due to Term

• Current Assignee: Alfred Kã¤Rcher GmbH & Company KG
• Original Assignee: Alfred Kaercher GmbH & Company KG
• Inventors: Bauer, Horst, Nieuwkamp, Wolfgang
• Primary Examiner(s): Bertsch, Richard A.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/613,525
• Time in Patent Office: 782 Days
• Field of Search: 417/366, 417/370, 239/124, 239/127, 239/128, 137/389, 137/391, 137/423, 137/240
• US Class Current: 417/366
• CPC Class Codes: B05B 9/002 incorporating means for heating or cooling, e.g. the material to be sprayed
• CPC Class Codes: B05B 9/0423 for supplying liquid or other fluent material to several spraying apparatus
• CPC Class Codes: B08B 2203/007 Heating the liquid
• CPC Class Codes: B08B 2203/0205 Bypass pressure relief valves
• CPC Class Codes: B08B 2203/0223 Electric motor pumps
• CPC Class Codes: B08B 2203/0235 Cooling the motor pump
• CPC Class Codes: B08B 2203/027 Pump details
• CPC Class Codes: B08B 3/00 Cleaning by methods involving the use or presence of liquid or steam B08B9/00 takes precedence
• CPC Class Codes: B08B 3/026 Cleaning by making use of hand-held spray guns; Fluid preparations therefor

Abstract

In a high-pressure cleaning apparatus with a high-pressure pump for a cleaning liquid connected on the suction side to a preliminary tank with a feed pipe for cleaning liquid and having in the pressure pipe a bypass pipe branching off from this pressure pipe and leading to the preliminary tank, and with an electromotor driving the high-pressure pump and having a coolant pipe through which cleaning liquid flows, in order to also ensure effective cooling of the electromotor in the recirculation mode without loss of coolant, it is proposed that the feed pipe to the preliminary tank have a greater conveying capacity than the coolant pipe and that the coolant pipe lead into the preliminary tank in which there is a means for limiting the filling level.

Claims

1. A high-pressure cleaning apparatus comprising:

a high-pressure pump for a cleaning liquid coupled on a suction side thereof to a preliminary tank;

a feed pipe for feeding cleaning liquid to said preliminary tank;

a pressure pipe coupled to an output of said pump;

a bypass pipe branching off from said pressure pipe and leading to said preliminary tank;

an electromotor for driving said pump and having a coolant pipe through which cleaning liquid flows; and

means for limiting the filling level of said preliminary tank, including a filling level indicator in said preliminary tank, a closure valve in said coolant pipe actuated by said filling level indicator and a switch for switching off said electromotor;

wherein said feed pipe has a greater conveying capacity than said coolant pipe and said coolant pipe leads into said preliminary tank.

2. A high-pressure cleaning apparatus in accordance with claim 1 further comprising:

a closure member arranged in said feed pipe; and

top and bottom filling level indicators in said preliminary tank for actuating said closure member.

3. A high-pressure cleaning apparatus in accordance with claim 2 wherein said top filling level indicator is arranged underneath said means for limiting the filling level.

4. A high-pressure cleaning apparatus comprising:

a high-pressure pump for a cleaning liquid coupled on a suction side thereof to a preliminary tank;

a feed pipe for feeding heated cleaning liquid to said preliminary tank;

a pressure pipe coupled to an output of said pump;

a bypass pipe branching off from said pressure pipe and leading to said preliminary tank; and

an electromotor for driving said pump and having a coolant pipe through which cold cleaning liquid flows;

wherein said feed pipe has a greater conveying capacity than said coolant pipe and said coolant pipe leads into said preliminary tank.

5. A high-pressure cleaning apparatus in accordance with claim 4 further comprising:

a closure member arranged in said feed pipe; and

top and bottom filling level indicators in said preliminary tank for actuating said closure member.

6. A high-pressure cleaning apparatus in accordance with claim 5 further comprising:

means for limiting the filling level of said preliminary tank, including a filling level indicator in said preliminary tank, a closure valve in said coolant pipe actuated by said filling level indicator and a switch for switching off said electromotor.

7. A high-pressure cleaning apparatus in accordance with claim 6 wherein said top filling level indicator is arranged underneath said means for limiting the filling level.

8. A high-pressure cleaning apparatus in accordance with claim 4 further comprising:

means for limiting the filling level of said preliminary tank, including a filling level indicator in said preliminary tank, a closure valve in said coolant pipe actuated by said filling level indicator and a switch for switching off said electromotor.